39mm is not 39mm?

[frank]

Information (obtained with proper tool/measuring device) is power.

 

[ColColt]

Here's a shot of the filter in question(right) beside a Leica filter.

_1DF4116a by David Fincher, on Flickr

A closer shot of the Leica threads.

_1DF4117a by David Fincher, on Flickr

 

[MattKing]

Are there front threads on the Leica filter? Will the Nikkor filter thread into them?

 

[ColColt]

The Leica filter fits all my current lens, 50 f2 DR, 90mm Elmarit and the Zeiss 50 f2. The Nikon filter will only fit(in part) the DR lens.

the Leica filter does have a few threads it appears and the Nikon filter will screw into them but not far...sort of feels tight but doesn't fall out.

 

[jochen]

M 39 is not M 39

Hello,
besides the a.m. differences of metrical M 39 or E 39 filter threads, there is one peculiar thing with the so called Leica screw mount (LTM). This thread ha a metrical size of an M 39, the flange angle of 60° of a metrical thread but the pitch is 26 tpi which is nearly a M 39 x 1 (26 threads within 25.4 mm) but not exactly. It is not known why Oscar Barnack has chosen this peculiar thread. Often the LTM is referred to as M 39 x 1, which is not correct.

 

[Ian C]

The 39mm O56 Nikon filter shown in post #27 is most likely intended for one of the long focal length Nikon lenses that used screw-in rear filters. Older versions of Nikon filters had chrome-plated rings. Nikon later switched to black rings.

A good example of a Nikon lens using 39mm screw-in filters is the Reflex Nikkor 500mm f/8. This is illustrated on page 3 of the following manual. There is further information on filter use for this lens on pages 10 and 11. Other than the 39mm diameter the thread is not specified. Since the filter shown in post #27 isn’t 0.5mm pitch, 0.75mm pitch seems likely.

http://cdn-10.nikon-cdn.com/pdf/manuals/archive/Reflex-Nikkor 500mm f-8.pdf

The same filter set is used on the later versions of the Reflex Nikkor 1000mm f/11.

http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/reflex/1000mm.htm

The question of whether this filter might have fit an older Nikon rangefinder camera lens led to the table of filter sizes in the following link.

http://www.kenrockwell.com/nikon/rangefinder/sp-users-guide.htm

It doesn’t appear that the mystery 39mm Nikon filter could have fit a Nikon rangefinder camera lens.

 

[ColColt]

Since the filter shown in post #27 isn’t 0.5mm pitch, 0.75mm pitch seems likely.

Yep, that seems pretty obvious now. If I could figure out a way to get that glass out of that ring and had another Leitz filter ring I'd try and install it in that one. But, it may be just as easy to just order the right one from B&H.

 

[John Koehrer]

The Nikon's a bit unusual looking for the front of a lens but it could be for one of the catadioptric teles that use
filters at the rear of the lens.
Those filters are made without the female thread.

In E*bay speak that would make it "RARE"

FWIW I happen to have a Pentax filter that just drops into a 39mm filter ring. It too,
is "RARE".
Would you be interested in starting a collection?

 

[blockend]

The Industar 61 on my Bessa L rocks very slightly in the mount. As lens and camera mounts are solid, I've always assumed this was a discrepancy between modern Voigtlander/Cosina and Soviet M39 dimensions. It doesn't move sufficiently to wear the threads or cause focus issues, but I've thought of putting a very thin shim or rubber O-ring behind the lens to damp the movement. Is this idea a goer?

 

[Sewin]

The Industar 61 on my Bessa L rocks very slightly in the mount. As lens and camera mounts are solid, I've always assumed this was a discrepancy between modern Voigtlander/Cosina and Soviet M39 dimensions. It doesn't move sufficiently to wear the threads or cause focus issues, but I've thought of putting a very thin shim or rubber O-ring behind the lens to damp the movement. Is this idea a goer?

That's a good question. I'd be interested to know too as I'm considering a Bessa as I've a few M39 Soviet lenses.

I've the Industar 61 amongst others, is it a good combination with the Bessa?

 

[blockend]

I've the Industar 61 amongst others, is it a good combination with the Bessa?

The Industar 61 is a gorgeous lens. Medium contrast, lovely out of focus details and nicely made. It has a Barnack Leica look, if you had to compare it to anything. The Industar is still available new for £30-40 from FSU dealers.

 

[frank]

The Industar 61 on my Bessa L rocks very slightly in the mount. As lens and camera mounts are solid, I've always assumed this was a discrepancy between modern Voigtlander/Cosina and Soviet M39 dimensions. It doesn't move sufficiently to wear the threads or cause focus issues, but I've thought of putting a very thin shim or rubber O-ring behind the lens to damp the movement. Is this idea a goer?

This would change the focus registration. An o ring would definitely be way too much.

 

[blockend]

This would change the focus registration. An o ring would definitely be way too much.

Hmm, that's what I thought. The rock is less than my Fuji digital camera with Fuji lens(!) so I'll live with it.

 

[blockend]

That's a good question. I'd be interested to know too as I'm considering a Bessa as I've a few M39 Soviet lenses.

I've the Industar 61 amongst others, is it a good combination with the Bessa?

http://kenrockwell.com/tech/industar/55mm-f28.htm

 

[AgX]

The Industar 61 on my Bessa L rocks very slightly in the mount. As lens and camera mounts are solid, I've always assumed this was a discrepancy between modern Voigtlander/Cosina and Soviet M39 dimensions. It doesn't move sufficiently to wear the threads or cause focus issues, but I've thought of putting a very thin shim or rubber O-ring behind the lens to damp the movement. Is this idea a goer?

If the lens remains stationary I would try a strip of Teflon gasket tape, cut to the width of the thread.

 

[blockend]

If the lens remains stationary I would try a strip of Teflon gasket tape, cut to the width of the thread.

Good idea!

 

[aoresteen]

The 39mm O56 Nikon filter shown in post #27 is most likely intended for one of the long focal length Nikon lenses that used screw-in rear filters. Older versions of Nikon filters had chrome-plated rings. Nikon later switched to black rings.......

Correct. And Nikon also made 39mm drop-in filters for some long lenses as well.